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Food Packaging Films Widely Used In All Kinds Of Food Packaging Oct 16, 2017

What are the characteristics and uses of film for food packaging? Food packaging film usually refers to the diameter of less than 300mm, the thickness of 0.015 ~ 0.03mm low-density polyethylene adhesive. Low density polyethylene non-toxic, odorless, open, heat sealing, transparency is better, but also print text, patterns, it is widely used in all types of food packaging.

There are many ways to prepare food antibacterial packaging films. One is to prepare antimicrobial masterbatch by antibacterial agent or antimicrobial masterbatch and resin monolayer, or by co-extrusion as a surface layer and other layers to form an antibacterial composite film. And one by coating or depositing the antimicrobial agent on the resin film.

For the antibacterial film prepared by the antibacterial masterbatch, since the film itself is thin in thickness, it is required that the particle size of the antibacterial particles is small and is distributed by a narrow particle size or an organic antibacterial agent capable of being dissolved in the resin. The effect of the addition of antibacterial or antimicrobial masterbatch on the mechanical properties of the film is not very obvious, and the printing performance of the film is not adversely affected. But some of the film's barrier properties have a certain impact, so the choice of antibacterial agents and antimicrobial masterbatch should pay attention to antibacterial agents and antimicrobial masterbatch to join the film on the performance of the situation, select the appropriate antibacterial agent to ensure the performance of packaging Meet the requirements. General use of packaging materials are LDPE, LLDPE, EVA, cellulose film, edible film and so on.

For the method of coating or depositing the antimicrobial agent on the film, the gap between the different plastic self-barrier properties is large and the quality of the final product can be affected if the substrate is damaged during coating and coating. The surface properties of the surface of the plastic film, the performance of polarity, surface roughness, surface oxygen, nitrogen atoms will affect the percentage of film and antibacterial adhesive strength, thus affecting the antibacterial properties. In addition, the surface of the film substrate should be pretreated before the antimicrobial agent is applied or deposited onto the film, and the surface land energy can be improved and the bonding force can be improved. For the coating or evaporation of the packaging film substrate generally PET, PA, PVC, BOPP, LDPE and so on.

In addition to satisfying the mechanical properties required for the packaging itself, the printing performance, the display properties and other packaging materials must have the performance, the world's food for the packaging of food products have high health requirements. China's national standard GB-9687 provides for the health requirements of food packaging materials, requiring material color normal, no smell, no smell, no foreign body, and in the evaporation residue, potassium permanganate consumption, heavy metal content, decolorization experiments Aspects meet the corresponding requirements. The United States FDA on the food packaging materials composition, additive specifications, conditions of use, dissolution requirements, food packaging materials, chronic toxicity test requirements, sub-chronic toxicity test requirements have also made specific provisions.

At present, the compound antibacterial agent for food packaging, the organic antimicrobial agent in the Japanese market, and the compound antibacterial agent triazine antibacterial agent compounded with pyridine antibacterial agent have improved its antimicrobial effect by 3 -4 times. Domestic Haier Kehua Engineering Plastics National Engineering Research Center developed organic antimicrobial agents and inorganic antibacterial agent composite antibacterial agent, to overcome the KFHS series of antibacterial function of a single problem. In addition, nano-TiO2 can be added to the inorganic silver antibacterial agent in the food packaging film to solve the problem of slow antibacterial effect of silver antibacterial agent.

There are many ways to prepare food antibacterial packaging films. One is to prepare antimicrobial masterbatch by antibacterial agent or antimicrobial masterbatch and resin monolayer, or by co-extrusion as a surface layer and other layers to form an antibacterial composite film. And one by coating or depositing the antimicrobial agent on the resin film. In the case of

In addition to satisfying the mechanical properties required for the packaging itself, the printing performance, the display properties and other packaging materials must have the performance, the world's food for the packaging of food products have high health requirements. China's national standard GB-9687 provides for the health requirements of food packaging materials, requiring material color normal, no smell, no smell, no foreign body, and in the evaporation residue, potassium permanganate consumption, heavy metal content, decolorization experiments Aspects meet the corresponding requirements. The United States FDA on the food packaging materials composition, additive specifications, conditions of use, dissolution requirements, food packaging materials, chronic toxicity test requirements, sub-chronic toxicity test requirements have also made specific provisions.